Technical & General Discussion Area > Tech Torque Pre 1973

Another engine vibration

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minipete:
I have a slight vibration in my 64 with 289, top loader.  Engine (refreshed 30 years ago and not been apart since) is pretty stock and has always been smooth.

I can feel the vibration in the body of the car, even when sitting in neutral and revving the engine.  Engine runs and drives fine.

It starts at 1500 rpm and get worse as the revs rise.  Pushing the clutch in doesn't change it so unlikely a gearbox issue.

If I hold the gearlever the level of vibration is no worse than the what I feel in the body.

I am not sure if this is a normal vibration and now it is somehow transferring to the body or if it is a new vibration in the engine.

I recently pulled the shifter apart and to get access I took the gearbox mount off so that was my first suspect, I loosened off the mount and nothing changed.

I rehung the exhast as the mounts were old and stiff (like me).  No difference.

New engine mounts in, no difference.

Pulled the fan belts off to isolate the generator, water pump and PS pump, no difference.

I have done a close check all along underneath to see if any part of the driveline is touching the body, none that I can find.

Harmonic balancer looks fine, could there be an issue that you can't see from the outside?

I have checked the exhaust temps of each cylinder and engine is firing on all cylinders.  I fitted new plugs.

I have read all the previous posts on vibrations and none are like mine.

I have run out of things to check.

Any ideas anyone?

Clubman7:
https://forum.mustang.org.au/index.php?topic=21457.0
Some old info.

minipete:
Thanks for the link but I had read that one.  Mine is manual so no flex plate.

It has had the same engine/clutch/gearbox since the mid 70's and has run smooth for 45 years so setup isn't a problem, something has happened recently to cause the vibration, but what?

Reborn67:
Hey minipete, sounds like you have been quite thorough, not being familiar with a toploader myself, have a couple of general ideas, does the bell housing have an inspection cover so you can see the flywheel and clutch, and see if something has come lose or broken, does a flywheel have a counter weight like a flexplate? The pressure plate assembly will rotate regardless of pedal position and any imbalance in this will effect the engine,
Curious to see what you come up with, good luck, Andrew..,

Clubman7:
Harmonic balancers can go bad with age.
https://www.autoblog.com/2016/01/08/symptoms-of-a-bad-or-failing-crankshaft-harmonic-balancer/?guccounter=1&guce_referrer=aHR0cHM6Ly93d3cuZ29vZ2xlLmNvbS5hdS8&guce_referrer_sig=AQAAAHjNhB8yWRqtpG_3ru5s8k8n-VBt_lnFfldEFYSxaLG5-lLvfV1HRb9kt9ZQrKoz3Nb8rMsndYfVbK0idG5pt45ZfmUD6eym1ZuzeJSQ9wSi6JDYVFElC2bXgRovmZ91VrPib8tIZQnDItjU8VsAZ6j1QdKWj9AKn4RWtu20fQhe

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